Multicylinder internal-combustion engine.



H. LENTZ. A MULTIGYLINDEP. INTERNAL COMBUS'IION ENGINE. APPLIOATON TILBD NOV. 1G, 19l2.

1,074,055. Patented sepn 23,1913.

4 SHEETS-SHEBT l.

H. LENTZ. MULTIUYLINDER INTERNAL COMBUSTION ENGINE. PPfLIoATIon mum Nov. 1e, 1012.

' 1,074,055, y Patented sept, 23, 1913.

4 SHEETS-SHEET 2.

H. LENTZ.

MULTIGYLINDER INTERNAL GOMBUSTION ENGINE.

APPLIOATION mmv 110mm. m12.

1,074,055, 'Patented Sept. 23, 1913.

H. LENTZ. 1 MULTIOYLINDBR INTERNAL UOMBUSTION ENGINE. APFLIUATIOH FILED E07. 16, 1912.

1,074,055. Patented spt` 23,1913.

I" a. 76 :yf 7 I Math esse.; Jh Ven on v zzyalen Z represen ed y .Zug-M Maf/mmm;

I Toul! w71 om. t may concern.'

HUGO LENTZ, OF HALENSEE, NEAR BERLIN, GERMANY.

MULTICYLINDER INTERNAL-COMBUSTION ENGINE.

Speciicaton of Letters Patent.

Application filed November 16, 1912.

Patented Sept. 23, 1913.

Serial No. 731,668.

' e Be it known that I, HUGO LiiN'rz, a citig zen of the German Empire, and residing ati Halcnsee, near Berlin, Gerin-any, have in-f vented certain new and useful Improve-j Iments .in l\flulticylinder Internal-Coinbusf tion Engines, specification..

Myk invention Arelates to an internal, coinaf bustion engine provided with rotary valve O'eai, in which the waste gases are utilized ibil sucking cool air through the chambers to be cooled. According to my invention the arranged: nient" is such that the chambers traversed by;

of which the following is a; i

the cooling air directly surround the com ling heat to the combustible gases. In this v,b'ustion chambers andthe slide valve cas ing, while a gas chamber extending abov all the cylinders is arranged around these cooling chambers. By means o1 such a superposition of the two chambers I obtain the advantage that the hottest parts of tho cylinder are first cooled by in indifferent gas which-is itself aided in its cooling aci tion during the cooling process by deliver# manner not only can the cylinders and the valve casing be simultaneously cooled exceedinglyeffectively, but the combustible mixtureitself is utilized within suitable l limits for cooling, the more so as direct contact oi the gaseous mixture with the walls of the cylinders is not suitable here on account of the high temperature of the latter.

Various forms of four-cylinder, fourlstroke cycle, internal combustion engines jeinbodying my invention are represented by way of example in the accompanying drawings, wherein Figure 1 is avertical cross-section through oiic of the cylinders in one form of engine;

Fig 2 is a longitudinal section through the cylinder heads taken on the bent line II II vin Fig. 3; Fig. 3 is a horizontal sectional v View corresponding to the line III-III of Fig. 2. Fig. fi is a section taken on thc line IVhIV iii Fig. 3; Fig. 5 is a cross-section, enlarged, and Fig. 6 a longitudinal section, enlarged, through the rotary valve, while Fig. 7 is a longitudinal section, enlarged, showing the means ior cooling the latter; Figs. 8 to 11 show two other forms of engine, Fig. 8 being' a vertical cross-section through one of the cylinders and the suction device, and Fig. 9 is theA corresponding side elevation, partly in section, showing the one torni; Fig. 10 is a section through 'thc cyl indcr oit the other form, and Fig. ll is a see' tion taken on the bent line XLI-XI iii-Fig. 10 as seen in thc direction of the arrow A.

`Referring firstly to Figs. l to et, the engine cylinders l, 2, 3 and 4, whose pistons Work in the usual manner on a crank-shaft 5, are cast in one piece. 'Iheir upper part is surrounded by a wall 6 in suoli manner that a cooling jacket is formed. The cylinder head 7, likewise consisting of one piece, is mounted over the cylinders, and the `valve 9, which is constantly rotatedby the engine shaft 5 by means of gearing 37 represented in Fig. 9, is mounted in an inserted casing S.

Between the cylinders and the outer wall 6 a number of ribs 10 for conducting away the heat are arrangedin suoli 'manner that a corresponding number of chambers are `formed which are connected through open` ings 26 with the atmosphere. In addition, between the two middle cylinders 2 and 3 and the outside wall G are arranged partitions 11 and 12 which extend through the jacket chamber onl bothwgsides` 3), whereby two Vseparate chambers 13and lll are formed. The supply oi ffuel. is con- .nectcd to the former chamber by 'means of a pipe connected to theopeniiig 15 (FiglA).

The cylinder head` 7 is divided ifnto tiro chambers 1G and 17. The upper 'chamber 16 extends over -all the cylinders. It isfperinanently connected with the chamber 13, thus with the supply of fuel, by way of a channel `is very advantageously preliminarily heated.

The chamber 17 located below surrounds the combustion chambers of all the engine vcylinders and is connected .in the manner which will be understood from Figs. 1 'and' 2 with the cooling jacket chamber of the c ngine cylinders. In addition, the chamber 17 is connected with the chamber A14wliich'may be called the suction chamber for reasons stated subsequently, by a channel 36 whose side walls form the extension of the Walls`12. 110

Thel combustion 4 chamber-sof the indiyidual engine cylinders are formed for .the most part by suitable spaces in the lower wall of the cylinderhead. y They can be connected by, suitable ports or ducts 18 and recesses 19 provided in the rotary valve 9 either with the gaswsupply chamber or with the exhaust pipe 20.

A nozzle 21 having an annular outlet 22 1s connected to the exhaust pipe 20. This outlet is located opposite a suction nozzle 23.

The outlet 22 and the inlet of the nozzle 23 is surrounded by an annular channel 24 which is connected by a channel 25, cast on the crank-case, with the suction chamber 14 and consequently also with' the chambers to of the cylinders being considered at irst:

. When the gaseous mixture is sucked in the .valve 9 is so located that its chamber 19 esf-tablishes a connection between the gas chamber and the engine cylinder. `When vit rotates farther the *valve closes and the compresssion stroke and, subsequently the explosion stroke take place. During the exhaust eriod which now begins the valve estabishes -a connection of the cylinder with the exhaust pipe 20, so that the waste gases are ejected through the pipe 20 and the nozzle 22 with a great velocity and in the form of an exceedingly fine annular jet. Owing to the injector-like action a pressure below atmospheric is produced in the channel 2/1, so that the cold outer air enters through the openings 26 into the cooling jacket, traverses the individual chambers in the cylinders and in the cylinder head, cools these and is sucked away through the channel 24 and thenozzle 23. The entire engine is thereby cooled exceedingly favorably. As the individual chambers of the four cylinders are always connected, however, and always one of the cylinders is being exhausted, the air is constantly driven through the chambers to be cooled. In addition, owing to the velocity of the issuing jet of gas belng directly dependent on the quantity of the exhaust gases and consequently on the performance of the engine and the necessity of the same being cooled, the suction action and the change of air in the cooling jacket are also in direct dependence on the performance of the motor. Owing, on theother hand, to the gas jet issuing in the forni of a thinwalled tube, it penetrates like a blade and without eonslderable resistance into the air in front of the nozzle without rebounding from the same. Consequently, the gas issues noiselessly, so that the otherwise necessary silencer which causes la not immaterial increase of the counter pressure in the cylinder, thus a iminution of the efficiency, is en tirely done way with. The openings 26 are made relatively small so that the entering air must expand first in the cooling chamber.

A. more intensive cooling is thereby obtained because the air becomes colder owing to its instantaneous expansion. According to the present invention, however, the cooling chamber extends over the valve casing containing the rotary valve. For this purpose the valve casing is constructed as follows:

The rotary valve is mounted inv a special bushing 8 which is inserted in such manner in the cylinder head 7 that free chambers 27 are formed between the walls of the head and the bushing, which chambers surround the bushing for the most part but are separated from one another in the middle by a rib 4A. These chambers are Aconnected on the one hand with'the atmospherethrough openings 45 at the ends of the bushing 8 and, on the other hand, with the channel 36 through openings' 28 at the middle of the bushing. Owing to the suction action of the exhaust gases cold air is therefore sucked in through the openings 45 and flows around the outside of the bushing and therefore likewise effectively cools it and is sucked away through the openings 28, AOf course the ports Zl5 and 28 may be arranged as desired. It is only essential that the chambers 27 surrounding the bushing 8 be connected, on the Onehand, with the atmosphere and, on the other hand, with a chamber in which there is a pressure below atmospheric. This could therefore be the cooling jacket chamber. In order that this cooling may be specially effective the faces of the bushing 8 bounding the chambers 27 are provided with ribs 29 by which the heat is conducted' away more rapidly. In like manner, the hollow slide valve Qmay also he cooled from within. For this purpose, the one end of the samev is connected with the atmosphere (cf. Figs. 6 and 7 while the other, closed end is connected by bores 30 and 32 of the valve and ports 31 with the annular chambers 27 which are connected'in the above described manner to the suction ldevice. The interior ofthe valve 9 is therefore effectively cooled by the sucked in outer air. In this manner provision is made that not only is the valve cooled within, but its bushing is cooled dil'n the enoinc re )resented in Fiffs. 8 and 9 each two cylinders l, 2 and 3, 4t are cast together and provided with conjoint heads 38 and 39. Otherwise the arrangement ot' the gas chamber 1G, ofthe cooling chamber '1.7 and also of the rotary valve 9 are the saine,

with the exception of the suction device, as 1n the engine according to Figs. 1 to 4.

Now according to my invention the suc- -l tion device is formed by the outer cylinder -so as in this case the cooling jacket chamber simultaneously surrounds the suction and delivery nozzles. exhaust nozzle extending over several cylinders has only the exhaust section neces sary for one cylinder,'because the exhaust from ,one cylinder can always extend over the entire nozzle. An exceedingly simple and compact construction of the entire engine is thereby obtained.

In the engine according to Figs. 8 and 9 each two cylinders are provided with a simple suction nozzle which extends over both cylinders and the entire length of the valve. As shown in Fig. 11, however, the suction device may extend over all the engine cylinders, it being connected directly to the exhaust port in the rotary valve casing.

Fig. 1Q shows another form of the suction device which is characterized by two delivery nozzles 43 and 44 with opposite suction nozzles 45 and 4G being arranged below the rotary valve. Both nozzles inclose between them a chamber 47 connected at its two ends with the cooling chamber 17. In this manner the cooling air can flow not only from without, but also from within to the two suction nozzles, whereby a greater cooling action is obtained with an equally simple construction of engine. The nozzles are constructed as separate parts and are connected by screws 48 with the valve cz sing.

I claim x- 1. In an internal combustion engine having a cylinder housed by a cooling chamber, said cylinder having an intake and exhaust port, a fuel passage disposed adjacent to said cooling chamber, a valve having a cooling chamber, the cooling chamber of the valve being in communication with the cooling chamber of the cylinder, said` valve being The cross-section of thel positioned on the cylinder to deliver' fuel from the fuel passage to the cylinderand to exhaust gases from the cylinder, and means in communication with the exhaust port whereby the exhaust gases create a circulation of air through the chambers.

2. In an internal combustion engine having cylinders partially housed by a cooling chamber, eac'h of said cylinders having an intake and exhaust port, a fuel passage disposed adjacent to said cooling chamber, a rotary valve having a cooling chamber, said valve` being positioned on the cylinders to deliver fuel from the fuel chamber to the cylinders, and the exhaust gases from the cylinders, partitions in the cooling chambers of the cylinders for providing compartments, each compartment having means for admitting air thereto, and means in communication with the exhaust port whereby the exhaust gases create a circulation of air through the chambers.

3. In a multi cylinder internal combustion engine, each of the cylinders having a common intake and exhaust port and a coolin chamber surrounding the cylinders, a. fue passage disposed adjacent to said cooling chamber and above the head of the cylinders, a rotary valve having a coolin chamber in communication with the coollng chamber of the cylinders, said valve being mounted to control communication between the fuel passage and the cylinders,l and between the cylinders, and exhaust ports, and means in communication with the exhaust ports whereby the exhaust gases create a circulation of air through the chambers.

4. In an internal'combustion engine having a common intake and exhaust port, and a. cooling chamber surrounding the cylinder, a fuel passage disposed adjacent to said cooling chamber, a valve jacket adjacent the cylinders, a valve operating in the jacket, said valve controlling communication between the fuel passage and the engine cylinder, and between said cylinder and the exhaust port, a bushing between the jacket and valve, means for holding the bushing in spaced relation with the jacket for providing a valve cooling chamber, and means in communication withthe exhaust port whereby the exhaust gases create a circulation of air through the chambers.

In testimony whereof, I alix my signature in the presence of two witnesses.

HUGO LENTZ. lVitnesscs HENRY IlAsrnR, vVoLnnMAn HAUr'r. 

